I really like this work of art. The shading is done correctly, and the realism is quite good, also. Maybe adding a darker background would be a better idea than a bright one, because the character is darker. One thing that I've learned, is that you want your eye to move all around the picture for it to be a good one. The small problem with this picture, is that the eyes on the cat pulls the viewers eyes straight to that spot, because they are kinda bright and attention grabbing. I'm not saying that its a bad thing, but maybe if you added a background and lightened up the fur a little bit, then your eyes will move throughout the picture more, than just focousing on the eyes on the cat.
Other that that, its a great picture. Keep up the amazing work : D